I think you'll find that these are much easier to align than what you may have experienced in the past, because of the vastly improved dish mount. I installed a Slimline yesterday over at my brother's, and after setting the EL and tilt in accordance with his location, the 101 was acquired in the 90's on the first swing of the dish on the mast through the AZ. The 103's were already in the 50's. It helps a lot to have a perfectly plumb mast.
To obtain the best signals on 99/103, I had to adjust the tilt almost 15 degrees from the initial setting, and I wasn't able to get any 99/103's in the 90's. Don't know what that's all about yet. Maybe the dish was slightly warped. I've got to check that out today, since now he wants me to move it from where the 18" dish was, up the side of the house, to a more hidden location on the back side of a small out building: (Brother, getting off tractor...."That thing is huge
What bothered him the most, however, was that the mast arm, being one of the older ones without an adjustment joint in it, had been manufactured such that the only way the mast could be plumb was to have the mounting plate seriously out of level on the lapboard siding. This looked rather sloppy and odd, and he freely admitted to having OCD about such things. So I told him, "OK, Mr. Monk, we'll put it on the back of the 'apple house'." This is where I'd wanted to put it in the first place, since it would be at ground level for easy adjustment. I told him to start digging the trench for the conduit. Always great helping your siblings....